In 1859, Charles Darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. He defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".
Mutation- a permanent change in the DNA sequence that makes up a gene.
The answer would be D. It has no effect.
The dominant allele is the one that gets expressed. So a heterozygous individual(for a particular gene) has the same phenotype(characteristics) as a homozygous dominant individual.
Answer:
Nitrogen is so vital because it is a major component of chlorophyll.Nitrogen is the fuel that makes plants go. It's used to synthesize amino acids, proteins, chlorophyll, nucleic acids, and enzymes. Plants need more nitrogen than any other element.Farmers who cultivate pulse crops like green gram, Bengal gram, black gram, etc. do not apply nitrogenous fertilizers during cultivation because these crops have "rhizobium bacteria".
The answer is C. a large population living in a small area